Patents by Inventor Stephen C. Benna

Stephen C. Benna has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5092091
    Abstract: A concrete control key-joint and divider form made from plastic which is substantially wedge-shaped with vertically spaced holes to receive plastic stakes with the stakes being secured to the plastic form by plastic bolts at substantially its mid-section, so that the form can be easily set to grade and locked to the stakes, then the plastic stakes and bolts can be cut off to form a smooth screeding surface and an expansion joint. The forms also provide transversely spaced holes through which smooth rods or rebar may be inserted to firmly hold the form in a vertical manner and yet allow the concrete slabs to expand and contract. The plastic material is also designed to expand and contract at substantially the same expansion coefficient as cured concrete, thus minimizing the working of the key-joint.
    Type: Grant
    Filed: May 7, 1990
    Date of Patent: March 3, 1992
    Inventors: Harold L. Hull, Kenneth A. Berry, Stephen C. Benna